Question $1$

An ore consisting of chromite $($ FeCr$2O4,$ Magnetite $($Fe$3$O$4)$ and Quartz $($ SiO$2$ is fed to a

magnetic separation circuit at the rate of $100\frac{t}{h}r$ solids. The first stage is a low intensity magnetic

separator $($LIMS$)$ and the magnetics fraction from this unit is fed to secondary stage LIMS unit

for further upgrading. The non$-$magnetics from both LIMS units are combined and fed to a wet

high intensity magnetic separator $($WHIMS$).$

Based on the following information:

Mass of chromite in the feed is twice the mass of magnetite in the feed.

Grade of $Cr$ in the feed is $9\mathrm{.}28\%Cr$

$\%$ magnetite recovery to LIMS $1$ magnetics $-98\%$

$\%$ Fe recovery to LIMS $1$ magnetics $-60\mathrm{.}2\%$

Mass of LIMS $1$ magnetic fraction $-12\mathrm{.}2$ tons $/$hour

$\%$ Chromite recovery to LIMS $2$ magnetics $-50\%$

$\%$ Magnettite recovery to LIMS $2$ magnetics $-98\%$

$\%$ Magnetite in LIMS $2$ non$-$magnetics $-11\mathrm{.}56\%$

$\%$ Chrome recovery to WHIMS magnetite $-95\%$

$\%$ Magnetite in WHIMS magnetic fraction $-1\mathrm{.}03$

Tons $Fe$ in WHIMS non$-$magnetic Fraction $-0\mathrm{.}387$

Calculate:

$1\mathrm{.}1$ The $\%$ Quartz in the LIMS $1$ magnetic fraction.

$1\mathrm{.}2$ The $\%Cr$ in the LIMS $1$ non$-$magnetic fraction

$1\mathrm{.}3$ The $\%Fe$ in the LIMS $2$ Feed

$1\mathrm{.}4$ The $\%$ Chromite in the LIMS $2$ non$-$magnetic fraction

$1\mathrm{.}5$ The $\%Fe$ in the WHIMS feed

$1\mathrm{.}6$ The $\%Cr$ in the WHIMS magnetic fraction

$Fe-56,Cr-52,O-16$